Answer / guest

Synchronous motor runs on the principle of MAGNETIC LOCKING
between two fields.

1)Armature field:Produced when a 3 phase balanced supply is
given to 3 phase balanced armature winding at stator.
Armature field rotates at synchronous speed.The direction
of rotation is given by the phase sequence of 3 phase
supply.

2)DC field:Rotor is brought up to synchronous speed by
external means in the same direction as that of rotation of
armature field. At the instant of MAGNETIC LOCKING(when the
speed of armature field and the speed of rotor are equal)
DC supply is given to DC field winding at rotor.

Motor runs at fixed speed which is called SYNCHRONOUS SPEED
as long the locking is there.

Author:arbelectbit@yahoo.com

Answer / navya.suryadevara

Synchronous motor works on magnetic locking principle.
When Ac supply connected to the stator of the synchronous
motor a rotating magnetic field will be produced in the
stator winding.
Dc supply is connected to the rotor of the synchronous motor
produces a field.
At the instant of stator field equal to rotor speed magnetic
locking obtained in the synchronous motor.
Because of this synchronous motor runs at fixed speed.
Fixed speed means synchronous speed which depends on the
number of poles and supply frequency.

Answer / avinash

Synchronous speed is the speed at which the stator field magnetisation is rotating, which depends on supply frequency and number of poles.

Rotor of the synchronous motor is a magnet that can LOCK with the rotating stator field and rotate at synchronous speed.

Rotor has to be externally brought to synchronous speed of the stator then it will continue at synchronous speed provided load is within limit.

Synchronous motor will rotate either at synchronous speed or come to stop.

Answer / shankarj23

In motor, there is a factor called slip. Due to which there
is difference between the actual speed (synchronous) and
resultant speed.

In synchronous motor, the slip is 0. that's the reason why
it runs at synchronous speed.

The fixed speed is called SYNCHRONOUS SPEED.

s= (Ns - N)/Ns

Ns=120f/p

i have done diploma and btech in EE and live in Chandigarh so kindly help me how can i make my competency certificate in my area.

0 Answers   Multi Metals, ONGC,

---

How can calculate thermal overload in relay?

1 Answers   ABB,

---

how many types of ACB breakers, describe briefly..?

0 Answers  

---

what is an alternator & generator

5 Answers  

---

What is the meaning of Dyn11 of Transformer.

17 Answers  

---

hello every one, what is the difference between the Kvar and farads, Rating on Power capacitor is for eg: x kvar, and normal capacitor is eg: x farads. what is the relation between these two?

3 Answers  

---

is tree is a good conductor and it may be used for conductor?

3 Answers  

---

what is the instrument used for measuring insulator RESISTANCE

5 Answers   TATA, Transco,

---

What is the use of Gateway RTU like ABB RTU 560 in power plant, SAS system ?

1 Answers   ABB,

---

If a transformer primary winding operates at 240v, the secondary at 120v and the load is 1500w & the transformer is rated at 92% efficient, what's the current flowing through the primary winding of the transformer? What is the formula for finding this?

0 Answers  

---

At 765Kv, I have seen the use of PT at line side for metering and CVT for protection, although as far as my knowledge is concern, PT at this voltage level will have huge loss and more cost as compared to CVT as CVT can also perform same function of Protection and Metering? So my question is why use PT and not CVT for metering and protection in order to reduce the cost.

1 Answers  

---

what is the VVVFD and?

4 Answers  

---